A screen pops up with information claiming to be from the FBI and asking for payment to unblock your computer, but it's actually a virus from thieves.

Victims have said they were instructed to make the payment through a MoneyPak card, which works like a cash card, within 72 hours.

"They are making a lot of money," said Austin Berglas, assistant special agent in charge with the FBI's cyber bureau. "It can be embedded in an individual's computer through the opening of a malicious email attachment."

No matter how the virus affects your computer, the FBI said you should not pay the so-called ransom.

"If you are a victim in a scam like this, obviously No. 1 is to know that the FBI would never ask anyone for money, hold a computer for ransom," Berglas said.

Daniel Norris took a three-hitter into the eighth inning in his Detroit debut, J.D. Martinez hit a three-run homer and the Tigers beat the Baltimore Orioles 6-1 on Sunday to earn a split of the four-game series.